Control device operated by change of liquid level



A. R. TRIST CONTROL DEVICE OPERATED BY CHANGE OF LIQUID LEVEL Jan. 18,1927. n 1,614,857

Filed Dec. 15, 1921 2 sheets-sheet 1 "1 I LU LU Jan. 18, 1927. 1,614,857

A. R. TRIST CONTROL DEVICE OPERATED BY CHANGE OF LIQUID LEVEL Filed Dec. l5 1921 2 Sheets-Sheet 2 21W f^\ J1 few/l MM, AM

Patented Jan. 18, 1927.

UNI TED 'S A TES ARTHUR RONALD Tarsu?,

OF LONDON, ENGLAND.

CONTROL DEVICE OPERATED BY vCHANGILOF LIQUID LEVEL.

ApplicationIedDecember 15,1921, Serial No.

:Thisinvention relates to-improvements in control devices operated by change ci liquid level 'and-hasfor its object thezprovision of meanswhereby elicient control may be more readily `obtained Vthan -with `known devices.

',The invention consists `in the arrangement of-'aifloatwithin'a.vessel connected to a receptacle lthe changeof liquid `level within whichaoperatesithe device; thisloat is associated Withmeansadaptedto discharge an .element,'fwhen .fsaid :float reaches a predetermined position, said element directly or indirectly iperforatingaa diaphragm and permittingvlud under pressure to operate a control device.

:In xorder that the vinventionmay be the better v.understood I 'will :now proceed to deribe `.the saine in Vrelation to .the .accompanying-drawings7 reference being had to the .flettersandligures marked thereon. Like letters 'refer .to like parts. in the variousifigures` in which \Fig.11 is ai sectional elevation cfa device constructed in accordance with this invention.

YFig.1.2;isaseetionalelevation. of Fig. 1 on the'liney2-g2.

Fig. -3 ,isan; enlarged detail :sectional view of inthe device f containing :the perforable diaphragm ini-place readyfor operation.

:Eig '4. is-,an enlargedrdetail sectional view somewhat similar to Fig. 3' but-showing the pesitionof the parts vafter the weight has fallen.

zFig. -5 :is an enlargedY det-ail vviewshowing the .operation of the detent Awhich prevents reassemblysofsthe'parts until'the weight is replaced.

.Fignff illustrates a method of replacing the rweight.

:Figa ,7 is a detail sectional view of a repair unit.

'The drawings villustrate one form of device.=adapted toenable'the supply of liquid fuel totherburners of a boiler to be discontinued or reduced upon the'level of the water within'the saidboiler reaching a predeterminedlevel.

Within avessel a connected to theboiler by connections b and c so disposed relative thereto that the level of the water within the vessel a corresponds with the water levelin the-boiler is Vdisposed-a float or the like d which is connectedby 4arod e'toa pivoted frame f adapted vto contain an element g. Therame fis mounted on a Vshaft h pivoted 522,656, and` in Great Britain Jamaryi7,1921.

at z' and said vshaft hbeingmohanimlly associated .with `the vrod fe by mms .0f v:a lever Z.

ln proximityy wi th the vvessel :a vis arranged a chamber m so disposedas to receive the element g vwhen itis dischargedifremnits traine f and direct itszfall sorthateit 'contacts with the part r otadevice nfloczted'inethe lower :part v of said chamber :m/,r the chamber m being connected with the Wessel 4a fhy ineans of the portway o.

The device n is located inahnusingin screwed into the lower'partlofvtheic m and comprises a plunger .pmarrfyinga peri'orating device q the head ,-r of said plunger preceiving theilnpact. ofrthe :falling element g. The housing n" isprnvidedwith a` pivoted detent s the ends of-whieh is engaged by the element -g 'when .it:is.dis`v tached thereto said chains-"al2 beingflso at-A tached to a device d3 locatedinfthe base df the vessel a sufficient slacknessbeingvallowed in the chains to allow of proper operation of float d during use.

In. apparatus controlled -by the levelof liquid in a receptacle .as -hereifnbefore 'described, diiiculty is experienced in obtain-- ing certainty of action owing to the disturbing influence of the movementof ifhe liquid due for example to thefpitching er rolling of the ship on which the a paratns is installed with the result that je level controlled Yapparatus becomes erratic -in action.

To obviate this a check device `of aparticular character is interposed between the vessel a and the boiler containingitheluid the level of which is the controlling factor. rlhis check device comprises a ball wghavin a small factor of buoyancy in theliquid the said ball io comprising athinhollow metal shell suitably loaded withcorkor thellke. The ball fw is containedin acoage'orjsimlar device a; having a seat y which islocate'd/n the connection between the vessel a and the boiler. Normally, when there is little or no movement of liquid, the ball w takes up a position away from the seat y and free communication between the vessel a and the boiler exist. When however, the level in the vessel a suddenly drops the rapid movement of the liquid overcomes the small amount of buoyancy of the ball fw and drags it downward into contact with the seat 1/ and prevents the level in the vessel a from being materially reduced. lmmediately the conditions become normal the ball 'w again rises and tree communication is restored.

In operation, as the water level falls in the boiler the water lever will tall in the vessel a associated therewith and the float CZ will descendand rotate the frame f about itsvpivots z' and la. `When the water level reaches a predetermined point the element g will be discharged from the frame pass through the chamber m, contact with the end 1 of the plunger p and torce the perforating device g through the diaphragm t thus allowing the iiuid pressure above the said diaphragm t to pass to a power operated fuel control valve .a connected with the device n and cut oil or reduce the flow of fuelto the burner.

When this has happened it is Erst necessary to ralse the level ot the water in the vessel a to its normal height; this is effected by introducing suilicient water into the boiler associated with the device. The steam and Vwater connections between the boiler and the device are of course provided with cocks or valves as is usual in such installations and as soon as the water level is reestablished both the steam cock and water cock are closed. The fitting c is nowremoved and the unit n comprising the plunger p, perorat-ing device g, diaphragm t and fitting u is withdrawn; the element g is replaced in the frame f by inserting a rod through the bore of the housing n as illustrated in Figure 6, said element g during the replacing action being guided into place by an Vinclined plane m suitably disposed relative to the chamber m and the frame f. l/Vhen the element g is in place, a repair unit a as illustrated in Figure is introduced and the fitting e replaced and connected up.

It will be seen that a repair unit a cannot properly be introduced until the element g has been replaced in the tramev f as when theV unit with the perforated diaphragm is withdrawn, lthe element g rests upon the end s of the detent s and deiiects the end s2 thereof into the bore of the housing n. The detent s is so balanced however that when the element g is removed the end s2 drops back into the recess provided and oiers no obstruction.

' Obviously the element g will not be retained in the frame f until the-water level has risen above the predetermined plane and the detent s operated by the element g will lprevent reinsertion or a device n until the element g is replaced.

l claim zl. A control device operated by change ot liquid level comprising a vessel incommuni cation with the liquid the change of level of which is being employed, a float in said vessel, a diaphragm having effective pressure on one side thereof, a perforating device adapted to pierce said diaphragm and allow the pressure to pass to the other side thereof, means released by the iioat adapted to force the perforating device through the diaphragm when the level of the liquid has reached a predetermined plane and control means adapted to be operated by the pressure passing from one side of the diaphragm to the other.

2. ln a control device asclaimed in claimv l the arrangement of a seat in the lower part oi the vessel below the water-line, a ball valve having al small margin of buoyancy for engaging with said seat to prevent discharge of the liquid from the vessel containing the float when. the device is installed under oscillating conditions which repeatedly vary the normal water level relative to a horizontal plane and a cage for retaining the ball valve in proximity with said seat. Y Y

3. A control device operated by change of liquid level comprising a vessel in communication with the liquid the change of level of which is being employed, a float in said vessel, a pivoted frame above said float, mechanical connections between said frame and said float, an unattached element in said frame, a chamber adapted to receive and guide said unattached element when discharged, a periorating device located in the chamber and adapted to receive impact con` tactV from the discharged element, a diaphragm adapted to be pierced by said per- ;t'orating device, a control device adapted to be operated by pressure passing through the perforated diaphragm a pivoted detent operated bythe discharged element adapted to prevent replacement of the perforating device until the dischargedV element has been replaced, an inclined plane above said chamber, adapted to guide said unattached element into its seat in the frame when said element is raised, a ball having a small margin of buoyancy, a seat for said ball in the lower part of the vessel containing the float and a cage adapted toY limit the movement of the ball relative to its seat substantially as described.

ln testimony whereof IV have signed my name to this specification.

ARTHUR RONALD TRIsT. 

